"This action is an assault on all advocacy organizations across the country," said William A. Brewer III, the NRA's attorney. "There can be no place in our society for this manner of behavior by government officials. Fortunately, the NRA, like all U.S. citizens, is protected by the First Amendment."

The NRA says the resolution was meant to silence the organization and its members for their pro-Second Amendment beliefs.

"Defendants undertook such unlawful conduct with the intent to obstruct, chill, deter, and retaliate against the NRA's core political speech," the suit states.

The resolution also calls on the city to "assess the financial and contractual relationships our vendors and contractors have with this domestic terrorist organization" and find ways to prevent them from doing business with the city.